Clinical radiology · 2025
Effect of high-tube current x-ray tube on computed tomography (CT) dose-index volume in low kilovolt peak (kVp) contrast-enhanced chest-abdomen-pelvis computed tomography (CT).
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Noda Y, Ishihara T, Kawai N, Kaga T, Miyoshi T, Hyodo F, Kato H, Kambadakone A R, Matsuo M
Аннотация
AIM: The aim of this study is to investigate the relationship between participants' body weights and radiation doses in contrast-enhanced chest-abdomen-pelvis computed tomography (CT) scans, using both older and newer CT scanners that can provide adequate output even at low tube voltages.
MATERIALS AND METHODS: Participants who underwent contrast-enhanced chest-abdomen-pelvis CT from September to December 2021 were prospectively randomised into four groups based on kilovolt peak (kVp) and maximum tube current on two scanners-group A (120 kVp, 835 mA), group B (80 kVp, 700 mA), group C (120 kVp, 900 mA), and group D (80 kVp, 1,300 mA). The relationships between the participants' body weights and CT dose-index volume (CTDIvol) were compared among the four groups using non-linear regression analysis. The background noise was compared between groups A vs B and C vs D.
RESULTS: A total of 118, 104, 100, and 106 participants were included in groups A, B, C, and D, respectively. The CTDIvol was lower in group B than in group A above the body weight of 57 kg (P < .001-.004). Similarly, the CTDIvol was lower in group D than in group C above a body weight of 68 kg (P < .001-.04). The background noise was higher in group B than in group A at abdominal and pelvic regions for participants weighing 57-67 kg (P < .001 for each); however, no difference was found between groups C and D (P = .21-.82).
CONCLUSION: High-tube current output CT scanners necessitate an increase in the participants' body weight threshold for low-kVp scans from 57 kg to 68 kg to achieve a reduction in CTDIvol.
MATERIALS AND METHODS: Participants who underwent contrast-enhanced chest-abdomen-pelvis CT from September to December 2021 were prospectively randomised into four groups based on kilovolt peak (kVp) and maximum tube current on two scanners-group A (120 kVp, 835 mA), group B (80 kVp, 700 mA), group C (120 kVp, 900 mA), and group D (80 kVp, 1,300 mA). The relationships between the participants' body weights and CT dose-index volume (CTDIvol) were compared among the four groups using non-linear regression analysis. The background noise was compared between groups A vs B and C vs D.
RESULTS: A total of 118, 104, 100, and 106 participants were included in groups A, B, C, and D, respectively. The CTDIvol was lower in group B than in group A above the body weight of 57 kg (P < .001-.004). Similarly, the CTDIvol was lower in group D than in group C above a body weight of 68 kg (P < .001-.04). The background noise was higher in group B than in group A at abdominal and pelvic regions for participants weighing 57-67 kg (P < .001 for each); however, no difference was found between groups C and D (P = .21-.82).
CONCLUSION: High-tube current output CT scanners necessitate an increase in the participants' body weight threshold for low-kVp scans from 57 kg to 68 kg to achieve a reduction in CTDIvol.